Remove RA_INTERVAL from config.h - it's configurable now.

src/config.h

@@ -45,7 +45,6 @@
 #define SOA_REFRESH 1200 /* SOA refresh default */
 #define SOA_RETRY 180 /* SOA retry default */
 #define SOA_EXPIRY 1209600 /* SOA expiry default */
-#define RA_INTERVAL 600 /* Send unsolicited RA's this often when not provoked. */
  
 /* compile-time options: uncomment below to enable or do eg.
    make COPTS=-DHAVE_BROKEN_RTC